Declaration of Anonymous types List

How about dynamic?

List<dynamic> dynamicList = new List<dynamic>();


dynamicList.Add(new { Name = "Krishna",  Phones = new[] { "555-555-5555", "666-666-6666" } }); 

You can make a list like this, but you'll again have to use some serious hackery, and you'll have to use some "type by example" situations. For example:

// create the first list by using a specific "template" type.
var list = new [] { new { Name="", Phones=new[] { "" } } }.ToList();

// clear the list.  The first element was just an example.
list.Clear();

// start adding "actual" values.
list.Add(new { Name = "Krishna", Phones = new[] { "555-555-5555", "666-666-6666" } });

It involves a bit of hackery but it can be done.

static List<T> CreateListFromSingle<T>(T value) {
  var list = new List<T>();
  list.Add(value);
  return list;
}

var list = CreateListFromSingle(
   new{Name="Krishna", 
                 Phones = new[] {"555-555-5555", "666-666-6666"}}
                );